diff --git a/libs/widgets/ardour_dropdown.cc b/libs/widgets/ardour_dropdown.cc
index 573b808414..33b26e6014 100644
--- a/libs/widgets/ardour_dropdown.cc
+++ b/libs/widgets/ardour_dropdown.cc
@@ -99,6 +99,7 @@ ArdourDropdown::set_active (std::string const& text)
 		}
 	}
 	set_text (text);
+	StateChanged (); /* EMIT SIGNAL */
 }
 
 bool